diff --git a/engine/tiles.go b/engine/tiles.go
index 28a215b..93934ce 100644
--- a/engine/tiles.go
+++ b/engine/tiles.go
@@ -137,8 +137,9 @@ type Tile interface {
 
 // Ensure StaticTile and AnimatedTile satisfy Tile.
 var (
-	_ Tile = StaticTile(0)
-	_ Tile = &AnimatedTile{}
+	_ Tile    = StaticTile(0)
+	_ Tile    = AnimatedTile{}
+	_ Scanner = AnimatedTile{}
 )
 
 // StaticTile returns a fixed tile index.
diff --git a/game/aw.go b/game/aw.go
index fe5a510..c8e3ad7 100644
--- a/game/aw.go
+++ b/game/aw.go
@@ -181,22 +181,18 @@ func (aw *Awakeman) Prepare(game *engine.Game) {
 		{Frame: 12, Duration: 3},
 		{Frame: 13, Duration: 3},
 	}}
-	aw.animWalkRight = &engine.Anim{
-		Frames: []engine.AnimFrame{
-			{Frame: 2, Duration: 6},
-			{Frame: 3, Duration: 6},
-			{Frame: 4, Duration: 6},
-			{Frame: 5, Duration: 6},
-		},
-	}
-	aw.animWalkLeft = &engine.Anim{
-		Frames: []engine.AnimFrame{
-			{Frame: 6, Duration: 6},
-			{Frame: 7, Duration: 6},
-			{Frame: 8, Duration: 6},
-			{Frame: 9, Duration: 6},
-		},
-	}
+	aw.animWalkRight = &engine.Anim{Frames: []engine.AnimFrame{
+		{Frame: 2, Duration: 6},
+		{Frame: 3, Duration: 6},
+		{Frame: 4, Duration: 6},
+		{Frame: 5, Duration: 6},
+	}}
+	aw.animWalkLeft = &engine.Anim{Frames: []engine.AnimFrame{
+		{Frame: 6, Duration: 6},
+		{Frame: 7, Duration: 6},
+		{Frame: 8, Duration: 6},
+		{Frame: 9, Duration: 6},
+	}}
 }
 
 func (aw *Awakeman) Scan() []interface{} { return []interface{}{&aw.Sprite} }
diff --git a/main.go b/main.go
index 8761ea7..d0a29cb 100644
--- a/main.go
+++ b/main.go
@@ -33,19 +33,19 @@ func main() {
 	}}
 	denseTiles := [][]engine.Tile{
 		{engine.StaticTile(9), nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, engine.StaticTile(9)},
-		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, &engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil},
-		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, &engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil},
+		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil},
+		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil},
 		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
-		{nil, nil, &engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
-		{nil, nil, nil, nil, nil, &engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
-		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, &engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil},
-		{nil, nil, nil, nil, &engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
-		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, &engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil},
-		{nil, &engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, engine.StaticTile(9), nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
+		{nil, nil, engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
+		{nil, nil, nil, nil, nil, engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
+		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil},
+		{nil, nil, nil, nil, engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
+		{nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, engine.AnimatedTile{Animer: greenTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, nil, nil, nil},
+		{nil, engine.AnimatedTile{Animer: redTileAnim.Copy()}, nil, nil, nil, nil, nil, nil, engine.StaticTile(9), nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, nil},
 		{nil, nil, nil, nil, nil, engine.StaticTile(9), nil, nil, nil, nil, nil, nil, nil, nil, nil, nil, engine.StaticTile(9), nil, nil, nil},
 		{nil, nil, nil, nil, engine.StaticTile(9), engine.StaticTile(9), engine.StaticTile(9), nil, nil, nil, engine.StaticTile(9), nil, nil, nil, nil, nil, nil, nil, nil, nil},
-		{engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), &engine.AnimatedTile{Animer: redTileAnim.Copy()}, engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8)},
-		{engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), &engine.AnimatedTile{Animer: redTileAnim.Copy()}, engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), &engine.AnimatedTile{Animer: greenTileAnim.Copy()}, engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7)},
+		{engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.AnimatedTile{Animer: redTileAnim.Copy()}, engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8), engine.StaticTile(8)},
+		{engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.AnimatedTile{Animer: redTileAnim.Copy()}, engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.AnimatedTile{Animer: greenTileAnim.Copy()}, engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7)},
 		{engine.StaticTile(9), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(7), engine.StaticTile(9)},
 	}
 	tiles := make(map[image.Point]engine.Tile)